An object with a mass of 25 g was placed into a graduated cylinder. The water in the cylinder rose from 50.0 mL to 65.0 mL. What is the density of the object? 2.0 g/mL
2.83 g/mL
0.38 g/mL
1.67 g/mL

What four properties do all waves have in common

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ

2ki + pb(no3)2 → 2kno3 + pbi2 determine how many moles of kno3 are created if 0.03 moles of ki are completely consumed.